Tree saw



FIG. 1 is a perspective view of the tree saw from an upper rear angle;

FIG. 2 is a perspective view of FIG. 1 from a lower front angle;

FIG. 3 is side elevation view of FIG. 1;

FIG. 4 is a top view of FIG. 1;

FIG. 5 is a bottom view of FIG. 1;

FIG. 6 is an end view of FIG. 1 from the front; and,

FIG. 7 is an end view of FIG. 1 from the rear.

The broken lines show portions of the article, which form no part of the claimed design. 

CLAIM I claim the ornamental design for a tree saw, as shown and described. 